Discover the hoverfly with love spots, not afraid of a wasp and can be hidden in plain sight.
Great Pied Plumehorn (Volucella pellucens)
Wing Length 10-15.5mm. Body size 13-17mm
Flight. May-Sep
Species to spot in Jul-Aug
A large, predominantly black hoverfly, distinguished by a broad ivory band across the abdomen and striking black-and-amber markings on the wings. It is commonly referred to as the Pellucid Hoverfly, with pellucid deriving from the Latin per (“through”) and lucere (“to shine”), meaning transparent or clear. However, as transparent wings are a feature shared by many hoverflies, the name has always felt somewhat unremarkable.
One of this species’ more distinctive characteristics is its feathery antennae, for this reason, I have begun referring to it as the Pied Plumehorn. The term pied—an adjective describing black-and-white colouration—follows the naming convention used for familiar British birds such as the Pied Wagtail and Pied Flycatcher. The name has since been adopted in several recent publications, including Guide to Flies of Britain & Ireland (2026) and Hoverflies of Britain and NW Europe (2023) both of which seek to promote the wider use of hoverfly English common names.
I have since added the prefix Great to reflect its size relative to other hoverflies that could also be considered pied, such as White – Clubbed Glasswing (Scaeva pyrastri). While these species share similar contrasting colouration, none possesses the distinctive plume-like antennae that make the Great Pied Plumehorn such a fitting and hopefully memorable name.
You have probably encountered this species resting on a bramble leaf just beyond the garden gate, hovering at head height along a sunny woodland path or within a sunlit glade. If you have read my previous post about the Humming Flowerfly (Syrphus ribesii), you will know that such an encounter is unlikely to bring good fortune or announce good news. I am also afraid to say that it is even less likely to settle on your outstretched hand. However, should you find one on a path come back the next day and it’s probably still there flying in the same spot, as they are known to be site faithful.
Research has shown that this hoverfly possesses a highly specialised visual region located in the upper-front portion of its compound eyes. Scientists refer to this area as an acute zone, or more informally, a "love spot". The photoreceptors within this region differ both structurally and functionally from those found elsewhere in the eye. Their microvilli—the light-sensitive structures within the photoreceptor cells—are capable of processing visual information at higher frequencies and transferring that information more rapidly. They are also remarkably sensitive to light. Together, these adaptations make the acute zone exceptionally effective at detecting fast-moving objects directly in front of the fly.
Perhaps this helps explain why these hoverflies are so reluctant to land on an outstretched hand. Long before you think you have caught them by surprise, they have almost certainly seen you coming.
These specialised photoreceptors are thought to play an important role in mate recognition and pursuit. Their enhanced temporal resolution allows males to:
- Detect other flies against a visually cluttered background.
- Track females during flight.
- Respond rapidly to sudden changes in direction.
Such abilities are particularly valuable in hoverflies, many of which engage in aerial courtship and prolonged mate-chasing. Similar adaptations have also been identified in other accomplished fliers, including dragonflies and houseflies, suggesting that acute visual processing has evolved repeatedly in insects that depend on fast aerial manoeuvres.
I have often observed these large hoverflies hovering curiously above my head and, many times, I have held out an outstretched hand in friendship. More often than not, they pause to investigate, circling close as if assessing this strange giant reaching out to them. On rare and special occasions, one will gently land on my hand, if only for a moment.
Those brief encounters may seem insignificant to some, but to me they are truly magical. In that instant, there is a genuine connection with a wild creature—a tiny bridge between two very different worlds. It is a reminder that nature is not something distant or separate from us, but something we can engage with if we take the time to slow down and appreciate it.
These simple moments fill me with a sense of wonder and gratitude. To earn the trust, however fleeting, of a creature that owes me nothing is a gift. Every encounter leaves me smiling, and for the rest of the day I carry with me a little more joy and a deeper appreciation for the wildlife that shares our world.
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The Great Pied Plumehorn belongs to Volucella, a genus that contains some of Britain's largest hoverflies, including the Lesser Hornet Plumehorn (Volucella inanis) and Greater Hornet Plumehorn (Volucella zonaria). While the larvae of many hoverflies feed on aphids or develop in decaying organic matter, Volucella species have adopted a rather different strategy. Their larvae develop within the nests of social wasps and bumblebees, where they live largely undetected among their hosts.
This remarkable ability to avoid detection is an example of crypsis—the art of remaining hidden in plain sight. For a creature intent on infiltrating the heavily guarded nest of a social insect, such stealth is not merely advantageous; it is essential.
The Great Pied Plumehorn begins its audacious nest heist by locating a suitable host nest. To do this, the female uses specialised odour receptors in her plume-like antennae, detecting the scent of a wasp colony in much the same way that a male moth tracks the pheromones of a female. Once she has found her target, she employs an even more remarkable strategy: chemical camouflage. By matching the odour profile of her hosts, she effectively cloaks herself in the nest's chemical signature, allowing her to bypass the tactile and olfactory checks of the guard wasps. To them, she is not an intruder at all, but simply another accepted member of the colony.
It sounds more like a plot from Mission: Impossible than the life cycle of a hoverfly. Yet this chemical deception is so effective that the female can enter the nest and lay her eggs without raising alarm. When the larvae hatch, they drop to the nest floor where they feed on accumulated organic waste and other debris within the colony. There they continue their development, usually pupating only after the wasp nest has declined or been abandoned at the end of the season.
In ecological terms, Great Pied Plumehorn is a fascinating hoverfly because it bridges multiple ecosystem services: pollination as an adult, decomposition and nutrient recycling as a larva, and indirect biological regulation within wasp nests, making it far more important than its relatively obscure reputation suggests.
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